CN103836703A - Molten salt heat storage type electric heating central heating system - Google Patents

Molten salt heat storage type electric heating central heating system Download PDF

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Publication number
CN103836703A
CN103836703A CN201410093965.XA CN201410093965A CN103836703A CN 103836703 A CN103836703 A CN 103836703A CN 201410093965 A CN201410093965 A CN 201410093965A CN 103836703 A CN103836703 A CN 103836703A
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salt
heating
hot
cellar
temperature
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CN103836703B (en
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马重芳
吴玉庭
任楠
刘斌
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Zhong Touyixing new forms of energy Investment Co., Ltd
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Beijing University of Technology
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Abstract

The invention relates to a molten salt heat storage type electric heating central heating system, and belongs to the technical field of heat storage. The molten salt heat storage type electric heating central heating system comprises a molten salt electric heater, a high-temperature hot salt tank, a low-temperature cold salt tank, a molten salt pump, a molten salt-water heat exchanger and a heat user. During the time period of low-price low off-peak electricity at night, the molten salt in the cold salt tank is pumped out through the molten salt pump to be conveyed to the molten salt electric heater for heating, and enters the hot salt tank after being heated up to high temperature. During the time period of a power utilization peak, the high-temperature molten salt, with accumulated heat, in the hot salt tank is pumped put through the molten salt pump to be conveyed to the molten salt-water heat exchanger and heats water used for municipal heating to produce hot water for supplying heat to residents. On the basis of a coal-fired boiler central heating system which is in general use at present, only a boiler room of the central heating system needs to be transformed into the molten salt heat storage type electric heating system, and neither a municipal heat supply pipe network nor heat supply terminal equipment needs to be transformed. Besides, the molten salt heat storage type electric heating central heating system can cut down a peak to supplement a trough and reduce the usage amount of coal, thereby playing a role in protecting the environment.

Description

Fused salt regenerative electrochemical heating central heating system
Technical field
The present invention relates to a kind of electrical heating hold over system, particularly relate to and adopt fused salt as accumulation of heat working medium, utilize the system of trough-electricity central heating, belong to heat storage technology field.
Background technology
Current haze shrouds Chinese multiple provinces and cities under Chinese situation and, in order to obtain pure and fresh air, has started one after another coal and changed electrical engineering.Beijing has started coal simultaneously and has changed gas engineering, made each large coal-fired boiler into gas-firing and heated, and what bring thus is that Pekinese's natural gas is seriously not enough.In addition, the development of society and the raising of living standards of the people, make China's power structure occur sharply to change, peak power wretched insufficiency, peak-valley difference continues to increase, the generating set fallback of paddy phase, for solving this contradiction, propose " peak load shifting " measure in power industry, implemented time-of-use tariffs, encouraged the electricity consumption of paddy phase.Adopt electrical heating salt melting system to realize central heating, can in the time of low power consumption, unnecessary electric power energy transform into heat energy be stored in high-temperature molten salt, in the time of peak times of power consumption, again the heat storing is discharged to heating, not only solve the pollution of city coal-burning boiler to air, alleviated especially an effective technological approaches of electrical network peak-valley difference.
Summary of the invention
In view of the deficiency that prior art exists, the invention provides a kind of trough-electricity heating high-temperature molten salt that adopts, for the fused salt regenerative electrochemical the saving energy and protect environment heating central heating system of peak times of power consumption heating.
A kind of fused salt regenerative electrochemical heating central heating system, is characterized in that: the brine heat exchanger 6, the hot user 7 that mainly comprise the fused salt electric heater 1 for making fused salt intensification heat accumulation, the hot salt cellar 2 that stores high-temperature molten salt, the cold salt cellar 3 that stores low-temperature molten salt, low-temperature molten salt pump 4, high-temperature melting salt pump 5, carry out heat exchange for fused salt and water.
Fused salt electric heater 1 adopts snakelike pipe 9 as heating element heater, there is housing the outside of snakelike pipe 9, housing is provided with fused salt outlet and fused salt import, fused salt outlet is provided with molten salt heater outlet temperature sensor 10, fused salt import is provided with molten salt heater inlet temperature sensor 11, the temperature that is used for monitoring heating fused salt, the snakelike pipe 9 of fused salt electric heater 1 is connected with power supply, for controlling the start and stop of electric heater.
The fused salt outlet of fused salt electric heater 1 is connected with the import of hot salt cellar 2 by pipeline, the outlet of hot salt cellar 2 is connected with the tube side import of brine heat exchanger 6 via high-temperature melting salt pump 5, the tube side outlet of brine heat exchanger 6 is connected with the import of cold salt cellar 3, the outlet of cold salt cellar 3 is connected with the import of fused salt electric heater 1 via low-temperature molten salt pump 4, and the closed pipeline that electric heater 1, hot salt cellar 2, cold salt cellar 3, low-temperature molten salt pump 4, high-temperature melting salt pump 5, brine heat exchanger 6 form is fused salt loop.
The shell side of brine heat exchanger 6 is communicated with composition water loop by supply channel 30, water return pipeline 31 with hot user, on brine heat exchanger 6 shell side exit supply channels, be equipped with water loop system pressure sensor 24, water loop system temperature sensor 25, water loop flow system flow sensor 26, water circulating pump 27 and constant pressure supply water and water treatment system 28 are installed on water return pipeline 31.
Hot salt cellar 2, cold salt cellar 3 tops are separately installed with hot melt salt pump 5, sloppy heat salt pump 4 that power is provided for fused salt, and each jar top is provided with two pump for liquid salts, the using and the reserved; Hot salt cellar temperature sensor 12 for monitor temperature is installed on hot salt cellar 2, and top is provided with the hot salt cellar level monitoring mouth 14 for monitoring liquid level, and bottom is provided with the hot salt cellar salt outlet 16 for emptying fused salt; Cold salt cellar temperature sensor 13 for monitor temperature is installed on cold salt cellar 3, and top is provided with the cold salt cellar level monitoring mouth 15 for monitoring liquid level, and bottom is provided with the cold salt cellar salt outlet 17 for emptying fused salt.
Hot salt line-pressure sensor 18, hot salt pipeline temperature sensor 19, hot salt piping flow sensor 20 are installed on the pipeline between fused salt electric heater 1 and hot salt cellar 2, cold salt line-pressure sensor 21, cold salt pipeline temperature sensor 22, cold salt piping flow sensor 23 are installed on the pipeline between fused salt electric heater 1 and cold salt cellar 3.
Fused salt circuit system (large dotted line frame), the pipe-line system that comprises be useful on carrying fused salt, and the pressure sensor 18,21 of installing in pipe-line system, temperature sensor 19,22, flow sensor 20,23;
Brine heat exchanger 6 adopts tube shell type structure, and fused salt is in pipe-line system, and water is in shell side system, and the two adopts forced-convection heat transfer form to carry out heat exchange.
Water loop system (little dotted line frame), comprises feed pipe, return pipe, and the temperature sensor 25 of installing in pipe-line system, pressure sensor 24, flow sensor 26, water circulating pump 27, hot user 7 and constant pressure supply water and water treatment system 28.
Fused salt regenerative electrochemical of the present invention heating central heating system also comprises controller 8, respectively with fused salt circuit system and water loop system each sensor and power supply 8 be connected.
Hot user 7 is the user side of heating, all can adopt the municipal pipeline hot-water heating system of having reserved to heat, and user's end equipment is also all without change.
Adopt fused salt mixt as accumulation of heat working medium, utilize trough-electricity to carry out the fused salt regenerative electrochemical heating central heating system of accumulation of heat.In the trough-electricity period at a low price at night, by pump for liquid salts, fused salt in cold salt cellar is extracted out and is transported to fused salt electric heater fused salt is heated to enter hot salt cellar after high temperature (approximately 500 ℃ of left and right), peak times of power consumption utilize pump for liquid salts that the high-temperature molten salt of accumulating heat in hot salt cellar is extracted out and is transported to the heating water generates hot water of fused salt-water-to-water heat exchanger heating municipal administration and heats to resident by day.For the coal-burning boiler central heating system generally adopting at present, as long as the boiler room of central heating system is transformed, be transformed into fused salt regenerative electrochemical heating system, municipal heating network and heating end-equipment all do not need to transform.
Evening, 22:00 was to 8:00 in morning next day, utilized trough-electricity to heat the low-temperature molten salt in cold salt cellar (3), and wherein a part is stored in high temperature melting salt cellar and waits until peak times of power consumption heating use, and a part directly enters brine heat exchanger and uses for the heating of paddy phase; Next day, 8:00 was to 22:00 in evening, and electric heating system quits work, and high-temperature molten salt pump startup is transported in brine heat exchanger heating water for heating by high-temperature molten salt.
The invention has the beneficial effects as follows: the present invention adopts central heating to combine with electrical heating accumulation of heat, adopt fused salt mixt that hot property is good as heat storage medium simultaneously.The liquid temperature wide ranges of fused salt, thermal capacity is large, and steam forces down, and fused salt circuit system is safe and reliable, has superior heat storage performance, and nontoxic, cheap and easy to get.Fused salt was heated energy was renewed evening, for the heating on daytime, took full advantage of valley period power power, alleviated electrical network peak-valley difference, had saved the energy.By using valley period power power to substitute coal combustion, reduce coal-fired use amount, greatly reduce the pollution to air.
Accompanying drawing explanation
Fig. 1 is composition structure chart of the present invention;
In figure: 1, fused salt electric heater, 2, high warm salt cellar, 3, low temperature cold salt cellar, 4, low-temperature molten salt pump, 5 high-temperature melting salt pumps, fused salt circuit system (large dotted line frame), 6, brine heat exchanger, 7, hot user, water loop system (little dotted line frame), 8, controller, 9, snakelike heating pipe, 10, molten salt heater outlet temperature sensor, 11, molten salt heater inlet temperature sensor, 12, hot salt cellar temperature sensor, 13 cold salt cellar temperature sensors, 14, hot salt cellar level monitoring mouth, 15, cold salt cellar level monitoring mouth, 16, hot salt cellar salt outlet, 17, cold salt cellar salt outlet, 18, hot salt line-pressure sensor, 19, hot salt pipeline temperature sensor, 20, hot salt piping flow sensor, 21, cold salt line-pressure sensor, 22, cold salt pipeline temperature sensor, 23, cold salt piping flow sensor, 24, water loop system pressure sensor, 25, water loop system temperature sensor, 26, water loop flow system flow sensor, 27, water circulating pump, 28, constant pressure supply water and water treatment system, 29, power supply, 30 supply channels, 31, water return pipeline.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.
Embodiment 1
As shown in Figure 1, a kind of regenerative electrochemical heating central heating system of fused salt as accumulation of heat working medium that adopt, comprise the power supply that electric energy is provided, Molten salt heating system, fused salt heat reservoir, fused salt heat exchange system and district heating system, concrete structure is as follows: described fused salt electric heater 1 adopts snakelike pipe 9 as heating element heater, suffered thermal stress restriction is less, and toggle speed is faster, is applicable to power supply frequent start-stop and variable load operation demand.Described accumulation of heat working medium is fused salt mixt, and it is large that fused salt mixt has thermal capacity, Heat stability is good, viscosity is low, and vapour pressure is little, liquid temperature wide ranges, the plurality of advantages such as cost is low, can be converted into high temperature heat by trough-electricity by heating fused salt and be stored in high-temperature molten salt.Described fused salt heat reservoir adopts double-pot type arrangement, and it comprises cold salt cellar 3 for storing low-temperature molten salt and for storing the hot salt cellar 2 of high-temperature molten salt, the two is cylindrical structural, adopts stainless steel, dome lid, and external insulation, vertically places.Cold salt cellar 3 is the low-temperature molten salt after heat-exchange system heat release for stocking system initial start stage or run duration, and hot salt cellar 2 is for storing the high-temperature molten salt after molten salt heater heat temperature raising; Be separately installed with two low-temperature molten salt pumps 4 and two high-temperature melting salt pumps 5 at cold salt cellar 3 and hot salt cellar 2 tops, all adopt the form of the using and the reserved, prevent from occurring because pump for liquid salts fault causes the contingency of whole system.Pump for liquid salts is long shaft submerged pump, adopts the vertical installation in top.Cold salt cellar 3, is all provided with temperature sensor 12,13 on hot salt cellar 2, for monitoring the temperature of the two.The two is equipped with level monitoring mouth 14,15, can feed back the safe liquid level of fused salt by liquid level sensor.Salt pot bottom is all designed with the salt outlet 16,17 of fused salt, during for accident or conventional maintenance, fused salt is emptying.
Described fused salt circuit system (large dotted line frame), comprises hot salt pipeline, cold salt pipeline, and pressure sensor 18,21 on pipeline, temperature sensor 19,22, flow sensor 20,23.Signal is passed to controller 8 by these sensors, and 8 comprehensive these signals of controller constantly regulate the frequency of high-temperature melting salt pump 5 and low-temperature molten salt pump 4 to meet different operating conditions.Described water loop system (little dotted line frame), comprises feed pipe, the pressure sensor 24 on return pipe and pipeline, temperature sensor 25, flow sensor 26, water circulating pump 27, hot user 7 and constant pressure supply water and water treatment system 28.
In addition, fused salt heat exchanging equipment all adopts fused salt to walk shell-side, and water under high pressure/steam is walked the arrangement of pipe side, thereby attenuate shell wall is greatly cost-saving, while being also beneficial to systematic failures or conventional maintenance simultaneously, fused salt is emptying.
Operation principle of the present invention and implementation procedure are as follows:
Take Pekinese's time-of-use tariffs as example, at 22:00-morning 8:00 at night, fused salt electric heater starts, utilize trough-electricity that the low-temperature molten salt (being about 200 ℃ of left and right) of being extracted out from cryogenic tank by low-temperature molten salt pump is heated to high temperature (being about 500 ℃ of left and right), regulate the fused salt of high warm salt cellar to import and export flow by flow sensor, a part of high-temperature molten salt is stored in hot salt cellar, for the heating of peak times of power consumption, a part enters brine heat exchanger, for the heating at night.Enter the high-temperature molten salt of brine heat exchanger and municipal water use and carry out heat exchange by forced convection form municipal water use is heated to 95 ℃ from 70 ℃ of left and right of import, the low-temperature molten salt after heat exchange is got back to cold salt cellar, completes cycle heat exchange one time.Municipal water use after heating enters water knockout drum, is assigned to each hot user side, and municipal water use completes once circulation, comes together in water collector, for carrying out heat exchange next time with high-temperature molten salt.8:00-22:00 in evening by day, electric heater is out of service, and the pump for liquid salts of hot salt cellar is constantly transported to high-temperature molten salt in brine heat exchanger, for the heat exchange of fused salt and municipal water use, realizes the heating of peak times of power consumption.The fused salt of heat release cooling is got back in low-temperature molten salt tank.
Whole system all realizes by microcomputer controller 8 Based Intelligent Control.This microcomputer controller carrys out start and stop and the heating power of intelligent adjusting fused salt electric heater by the signal of the feedback such as temperature sensor, flow sensor, and the flow that regulates the frequency of pump for liquid salts in hot and cold salt cellar to control fused salt meets the different demands of hot user side.

Claims (7)

1. a fused salt regenerative electrochemical heating central heating system, is characterized in that: mainly comprise fused salt electric heater (1) for making fused salt intensification heat accumulation, store high-temperature molten salt hot salt cellar (2), store low-temperature molten salt cold salt cellar (3), low-temperature molten salt pump (4), high-temperature melting salt pump (5), carry out the brine heat exchanger (6) of heat exchange, hot user (7) for fused salt and water;
Fused salt electric heater (1) adopts snakelike pipe (9) as heating element heater, there is housing the outside of snakelike pipe (9), housing is provided with fused salt outlet and fused salt import, fused salt outlet is provided with molten salt heater outlet temperature sensor (10), fused salt import is provided with molten salt heater inlet temperature sensor (11), the temperature that is used for monitoring heating fused salt, the snakelike pipe (9) of fused salt electric heater (1) is connected with power supply, for controlling the start and stop of electric heater;
The fused salt outlet of fused salt electric heater (1) is connected with the import of hot salt cellar (2) by pipeline, the outlet of hot salt cellar (2) is connected with the tube side import of brine heat exchanger (6) via high-temperature melting salt pump (5), the tube side outlet of brine heat exchanger (6) is connected with the import of cold salt cellar (3), the outlet of cold salt cellar (3) is connected with the import of fused salt electric heater (1) via low-temperature molten salt pump (4), electric heater (1), hot salt cellar (2), cold salt cellar (3), low-temperature molten salt pump (4), high-temperature melting salt pump (5), the closed pipeline that brine heat exchanger (6) forms is fused salt loop.
The shell side of brine heat exchanger (6) is communicated with composition water loop by supply channel (30), water return pipeline (31) with hot user, on the supply channel of brine heat exchanger (6) shell side exit, be equipped with water loop system pressure sensor (24), water loop system temperature sensor (25), water loop flow system flow sensor (26), water circulating pump (27) and constant pressure supply water and water treatment system (28) are installed on water return pipeline (31).
2. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: hot salt cellar (2), cold salt cellar (3) top are separately installed with hot melt salt pump (5), sloppy heat salt pump (4) that power is provided for fused salt, each jar top is provided with two pump for liquid salts, the using and the reserved.
3. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: the hot salt cellar temperature sensor (12) for monitor temperature is installed on hot salt cellar (2), top is provided with the hot salt cellar level monitoring mouth (14) for monitoring liquid level, and bottom is provided with the hot salt cellar salt outlet (16) for emptying fused salt; Cold salt cellar temperature sensor (13) for monitor temperature is installed on cold salt cellar (3), and top is provided with the cold salt cellar level monitoring mouth (15) for monitoring liquid level, and bottom is provided with the cold salt cellar salt outlet (17) for emptying fused salt.
4. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: hot salt line-pressure sensor (18), hot salt pipeline temperature sensor (19), hot salt piping flow sensor (20) are installed on the pipeline between fused salt electric heater (1) and hot salt cellar (2), cold salt line-pressure sensor (21), cold salt pipeline temperature sensor (22), cold salt piping flow sensor (23) are installed on the pipeline between fused salt electric heater (1) and cold salt cellar (3).
5. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: brine heat exchanger (6) adopts tube shell type structure, fused salt is in pipe-line system, and water is in shell side system, and the two adopts forced-convection heat transfer form to carry out heat exchange.
6. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: also comprise controller (8), respectively with fused salt circuit system and water loop system each sensor and power supply be connected.
7. according to the fused salt regenerative electrochemical heating central heating system of claim 1, it is characterized in that: evening, 22:00 was to 8:00 in morning next day, utilize trough-electricity to heat the low-temperature molten salt in cold salt cellar (3), wherein a part is stored in high temperature melting salt cellar and waits until peak times of power consumption heating use, and a part directly enters brine heat exchanger and uses for the heating of paddy phase; Next day, 8:00 was to 22:00 in evening, and electric heating system quits work, and high-temperature molten salt pump startup is transported in brine heat exchanger heating water for heating by high-temperature molten salt.
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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN106026296A (en) * 2016-07-22 2016-10-12 大工(青岛)新能源材料技术研究院有限公司 Vehicle-mounted natural gas power generation mobile charging station
CN106091776A (en) * 2016-08-09 2016-11-09 天津滨海储能技术有限公司 Molten salt energy-storage heat-exchanger rig
CN106369655A (en) * 2016-10-20 2017-02-01 中投亿星红日太阳能科技有限公司 Fused salt heat accumulation type electric heating central heating system with middle evaporator
CN108007246A (en) * 2017-11-28 2018-05-08 北京工业大学 The regulatable low ebb electrical heating fused salt of heat exchange amount stores heat-releasing device and application method
CN108266782A (en) * 2018-01-10 2018-07-10 中国科学院理化技术研究所 A kind of heating system
WO2019076279A1 (en) * 2017-10-16 2019-04-25 深圳市爱能森科技有限公司 Multi-energy complementation application system
CN110906415A (en) * 2019-12-15 2020-03-24 张影 Central heating system suitable for steel constructs building

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CN102852742A (en) * 2012-08-30 2013-01-02 中国科学院电工研究所 Tower type solar thermal power generation system for heat absorber of vacuum heat absorption pipes
CN204084540U (en) * 2014-03-13 2015-01-07 北京工业大学 Fused salt regenerative electrochemical heating central heating system

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CN1093791A (en) * 1993-04-09 1994-10-19 东北电业管理局调度通讯局 Network variable load accumulated electric heating system
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106026296A (en) * 2016-07-22 2016-10-12 大工(青岛)新能源材料技术研究院有限公司 Vehicle-mounted natural gas power generation mobile charging station
CN106091776A (en) * 2016-08-09 2016-11-09 天津滨海储能技术有限公司 Molten salt energy-storage heat-exchanger rig
CN106369655A (en) * 2016-10-20 2017-02-01 中投亿星红日太阳能科技有限公司 Fused salt heat accumulation type electric heating central heating system with middle evaporator
WO2019076279A1 (en) * 2017-10-16 2019-04-25 深圳市爱能森科技有限公司 Multi-energy complementation application system
CN108007246A (en) * 2017-11-28 2018-05-08 北京工业大学 The regulatable low ebb electrical heating fused salt of heat exchange amount stores heat-releasing device and application method
CN108266782A (en) * 2018-01-10 2018-07-10 中国科学院理化技术研究所 A kind of heating system
CN110906415A (en) * 2019-12-15 2020-03-24 张影 Central heating system suitable for steel constructs building

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